Maybe I'm just not seeing what I don't want to see but it looks like a generic sub off ritual to me. If it was any other player nobody would think there's something up with him, I think. Also it's a rather unfair comparison as one of those clips were right after him scoring a goal, the other one, as you pointed out, was more about time wasting. He even walked to the far end of the pitch right before the board was shown.
Then again the Nike website thing looks rather conclusive. It's very unlikely it was just someone hacking it for fun as it was available in different languages (or someone really had nothing else to do). Then again I read somewhere that something similar happened to Arsenal with Mahrez, not sure about that though. Either way, would be extremely stupid to let him leave in January. Could break our season just when it was turning into something great.